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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
The first is diastolic pressure (Pd) which is essentially unrelated to heart rate directly, (that is, the heart rate does NOT affect diastolic pressure). There is no mathematical connection between heart rate and Pd.